Experimental device and representation method of multiphase medium high-temperature corrosion rate

Abstract

The invention discloses an experimental device and a representation method of multiphase medium high-temperature corrosion rate. The experimental device comprises an air distribution device, a heating device and a tail gas treatment device which are communicated sequentially, wherein the air distribution device comprises a mixing device and a plurality of air bottles which are communicated with the mixing device; a quality flow meter connected with a computer is arranged among the mixing device and the air bottles; and the heating device comprises a heating furnace and a quartz tube reactor in the heating furnace. The representation method comprises the following steps: carrying out a gas phase or gas-liquid phase high-temperature corrosion experiment on a test sample according to the experiment requirement, thereby obtaining the decrement of the weights of the test sample before and after being corroded, and then converting the decrement into the thickness of the corroded test sample as the generation thickness of the corrosion layer during the test period of the test sample; and carrying out line energy spectrum line scanning experiment on the corroded test sample, thereby obtaining the maximal migration depth of a corrosive element in the thickness of the test sample, and finally calculating the high-temperature corrosion rate. By adopting the experiment device and the representation method provided by the invention, the high-temperature corrosion rate and the corrosion degree of a corrosive factor on the test sample are truly reflected from the macroscopic and microcosmic views.

Description

technical field [0001] The invention belongs to the technical field of a high-temperature corrosion rate characterization method and an experimental device, and in particular relates to a multi-phase medium high-temperature corrosion rate experimental device and a characterization method. Background technique [0002] Industrial equipment that uses coal combustion to provide thermal energy supply works in a corrosive and complex environment with high temperature and ash-containing airflow. The cross-sectional heat load and the rotational momentum flow moment of the dust-laden air flow are constantly increasing, which aggravates the tendency of furnace slagging and high-temperature corrosion. Especially in the pulverized coal burner area, due to the continuous change of combustion conditions and the adoption of low-NOx combustion technology, the A corrosive atmosphere of alternating oxidation-reduction appears in the burner area, which intensifies the high-temperature corrosi...

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Problems solved by technology

[0005] For the determination of high-temperature corrosion rate, the general method in the past is to weigh the sample before and after corrosion to obtain the corrosion weight gain of the sample, and use the corrosion weight gain per unit time to express the high-temperature corrosion rate. This method cannot be intuitive Indicates the progress of high-temperature corrosion; another method is to measure the thickness of the corrosion layer after corrosion of the sample by means of metallographic microscope or scanning electron microscope, and use the thickness of the corrosion layer per unit time to characterize the high-temperature corrosion rate. Considering the degree of corrosion from a macroscopic point of view, it cannot reflect the influence of microscopic corrosion factors, so sometimes it cannot accurately characterize the actual high-temperature corrosion rate of metals

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